tnsnames.ora文件说明

目录位置

unix:$ORACLE_HOME/network/admin

WINDOW:%ORACLE_HOME%\network\admin

设置相应的环境变量：TNS_ADMIN

tnsname.ora文件内容例子

--负载均衡，故障转移
sample2=
 (DESCRIPTION=
   (LOAD_BALANCE=on)
   (FAILOVER=on)
   (ADDRESS_LIST=
     (SOURCE_ROUTE=yes)
     (ADDRESS=(PROTOCOL=tcp)(HOST=host1)(PORT=1630))
     (ADDRESS=(PROTOCOL=tcp)(HOST=host2)(PORT=1521)))
  (ADDRESS_LIST=
     (SOURCE_ROUTE=yes)
     (ADDRESS=(PROTOCOL=tcp)(HOST=host3)(port=1630))
     (ADDRESS=(PROTOCOL=tcp)(HOST=host4)(port=1521)))
   (CONNECT_DATA=(SERVICE_NAME=sales.us.example.com)))

tnsname复杂配置